[Whatsapp] support backslash escaped quotes

Merge pull request #2 from verloop/PL-7711

support backslash escaped quotes

v1.0.0: Merge pull request #1 from verloop/PL-5500-b

Adding MD to Whatspp Conversion

[Fix] Space before header

v0.0.4-rc.9

addign new line before header

[Fix] fixing HRule

v0.0.4-rc.8

adding fix for new line before ---

Handling HRule

v0.0.4-rc.7

adding text block

Removing Hardline break when multiple spaces are placed at the end of sentence

v0.0.4-rc.6

removing space hardbreak

Removing underline header

v0.0.4-rc.5

removing underline heading

Fixing header

v0.0.4-rc.4

heading fix

Support for new line

v0.0.4-rc.3

adding support for \n

[Fixing headers]

v0.0.4-rc.2

adding small fix